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TROUBLESHOOTING IN

DVD PLAYERS

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CONTENTS

What is a DVD Player?

Parts of DVD Player. Working of DVD Player.

Faults in DVD Player. What is Troubleshooting?

Need of Troubleshooting. Where is it used?

Troubleshooting in DVD players.

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WHAT IS A DVD PLAYER?

Digital versatile discor Digital video disccommonly known as DVD is used for digitaloptical disc storage

DVD playeris a de!ice that plays discsproduced under both the DVD"Video and DVD"udio technical standards# two different andincompatible standards.

DVD players are connected to a tele!ision towatch the DVD content# which could be a mo!ie# arecorded TV show# or other content.

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dditionally# most DVD players allow users to play audio$Ds %$D"D# &P'# etc.( and Video $Ds %V$D(.

few include a home cinema decoder %i.e. Dolby Digital#Digital Theatre )ystems%DT)((.

)ome newer de!ices also play !ideos in the &P*+", )P!ideo compression format %such as Di!-( popular in thenternet.

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PARTS OF DVD PLAYER

Optical system:The optical system mainly consists of the laser beam# lenses#prism# photo"detectors and also mirrors. The output of thismechanism will be the input for the disc"dri!e. The laser beam

will be a red laser diode which works at a wa!elength of /00nanometres.

Disc drive mechanism:The disc dri!e mechanism consists of a motor that will dri!e thedisc in a circular motion. The mechanism will also ha!e a disc

feed 1 a loading tray that is used to accept the DVD from theuser. Thus the entire disc dri!e is basically a spindle that holdsthe disc and a motor that is used to circle the disc.

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PARTS OF DVD PLAYER

Printed Circuit Board:

The electronic outline must be drawn on the P$2 with thecorrect placement of all the $3s resistors as well ascapacitors. fter the outline has been drawn# the components

must be soldered to their respecti!e places. ll the primarycomponents of the electronic circuit should be made out ofsilicon.

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WORKING OF DVD PLAYER

The pits and bumps in the DVD are hit by the laserfrom the optical mechanism of the DVD player. Thislaser will be reflected differently according to thechange of pits and bumps.

Though the laser hits a single spot# the DVD mo!es ina circular motion so that the entire area is co!ered.&irrors are also used to change the spot.

These reflected laser beams are then collected by a

light sensor %e.g.. photo"detector( which con!erts thedifferent signals into a binary code.

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WORKING OF DVD PLAYER

The optical system helps in con!erting the datafrom the DVD into a digital code.

The binary signal is then sent to a Digital tonalog con!erter which will be setup in the P$2.Thus the corresponding analog signal of the DVDis obtained.

The P$2 also has amplifiers which amplify thesignal and then sends it to the graphic and audiosystems of the computer4TV. Thus# thecorresponding audio4!ideo signal is obtained.

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WORKING OF DVD PLAYER

The basic working of a DVD player is shown below.

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FAULTS IN A DVD PLAYER

DVD Player is a comple5 set of e6uipmentha!ing mechanical# optical and electronicscomponents which are prone to faults.

DTS Disabled:When a disc is designed to ha!epro!ision of 7Digital Theatre )ystem %DT)(3 andthe player is not able to produce it then theplayer has 7DT) disabled3 fault.

Aspect Ratio: DVD may ha!e an aspect ratioof ,8'# but with the player set for 9/8: aspectratio# the images appear thin and tall in display.

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FAULTS IN A DVD PLAYER

echanical Connections:&any problems pertain to themechanical connections. $ables and plugs may become loosewhich lead to loose connections and causes problems.

Dirty lens or disc: &any common problems are caused dueto this like disc being not recogni;ed# audible noise# erratictracking and sticking or skipping.

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FAULTS IN A DVD PLAYER

!eographical Conditions:ncompatibility due togeographical locations# will not allow the DVD player towork. TV standards of scanning# colour coding anddecoding# bandwidth etc. are different for different

countries. For e.g." player designed for *ngland willnot work in France

nother common fault is that the disc may stop playinghalfway through# which mainly happens in dual layeredDVDs. pause of half a second is normal# but if itstops working for more time then the DVD needsreplacement.

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WHAT IS TROUBLESHOOTING?

t means to locate the faulty component orconnection in the e6uipment and determining thecause of its becoming faulty.

Troubleshooting includes8

i. $orrecti!e &aintenance%repair(

ii.

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NEED OF TROUBLESHOOTING

&odern electronic de!ices although reliable# present somepotential problems.

)ome of the common problems can be gi!en as follows8i. The de!ices are sensiti!e to dust# !ibrations# humidity andtransients in power supply !oltage.ii. The $s used in the e6uipment are prone to electrostaticcharge and heat. The abo!e mentioned problems cause the de!ices to not

work in proper manner.

n order to reduce the faults in the de!ice we need totroubleshoot them. fter troubleshooting# the de!ice works in a appropriate

manner.

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WHERE IS IT USED?

Troubleshooting is almost used in e!ery field to get aaccurate output of a de!ice or a system.

Few of them are listed below8

i. Public ddress )ystem ii. )tereo mplifiers

iii. V$=

i!. Tape =ecorder

!. DVD Player

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TROUBLESHOOTING IN DVD PLAYER

DTS Disabled:To troubleshoot this fault we ha!e to enablethe player for DT) output which is by default turned off inthe players.

echanical connections: To remo!e the problems due tothe mechanical connections# unplug the connection# clean the

contacts and refi5 an then try to use. n most of cases thefault would disappear.

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TROUBLESHOOTING IN DVD PLAYER

Dirty "ens#Disc: For this# cleaning of the lens4disc is theprimary thing to be done. soft cloth or paper towelmoistened with water# is used to clean the disc and lens.The disc should be cleaned from the centre to edge anddried# using a lint free cloth.

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TROUBLESHOOTING IN DVD PLAYER

Substitution method:t is the best and 6uickest method tofind out the player is faulty or not. First check the DVD# ifit doesn3t work properly# insert an another one . f theanother DVD works alright then DVD is faulty. f a goodDVD also does not work# then the fault is in player. Tryconnecting the player to some another monitor# if it worksthen monitor was not working properly and if not the playeris faulty.

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REFERENCES

Wikipedia

i. en.wikipedia.org4wiki4DVD

ii. en.wikipedia.org4wiki4DVD>player

udio and Video )ystems by =.+ +upta

www.circuitstoday.com4working"of"d!d"player www.madehow.com4Volume",4DVD"

Player.htmli5;;'nllmekc

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THANK YOU